Simplify and evaluate the following expression

MATHEMATICS · Subjective · CBSE · Mathematics · Number Systems · Number Systems

Problem

Simplify and evaluate the following expression. (i) Simplify

(2x^{-3}y^{4})(-5x^{2}y^{-1})

so that only positive exponents appear in your answer. (ii) Hence, find the numerical value of the simplified expression when

x=-2

and

y=\dfrac{1}{2}